Calculate particle numbers using density, radius, and sample mass. Review units and core assumptions carefully. Save data, print summaries, and visualize trends clearly today.
| Material | Diameter (nm) | Density (g/cm³) | Mass (mg) | Volume (mL) | Purity (%) | Dilution | Estimated Concentration (particles/mL) |
|---|---|---|---|---|---|---|---|
| Gold | 50 | 19.3 | 2.5 | 25 | 98 | 5 | 1.550777e+10 |
| Silica | 80 | 2.2 | 1.8 | 30 | 95 | 4 | 9.795720e+09 |
| Silver | 40 | 10.49 | 1.2 | 15 | 99 | 2 | 2.985712e+10 |
Adjusted particle volume: V = shape factor × (π/6) × d³ × 10-21 cm³, where d is diameter in nanometers.
Mass per particle: mp = ρ × V, where ρ is density in g/cm³.
Adjusted sample mass: ma = sample mass × purity/100.
Estimated particle count: N = ma / mp.
Original concentration: C = N / suspension volume.
Diluted concentration: Cd = C / dilution factor.
Original molarity: M = (C × 1000) / NA, where NA is Avogadro’s constant.
Surface area per particle: A = πd². Total surface area equals A multiplied by particle count.
This approach assumes an average particle diameter and uniform material density. The shape factor adjusts volume when real particles deviate from ideal spheres.
Nanoparticle concentration is often needed in colloid research, sensor development, toxicology, catalysis, and optical experiments. Mass alone rarely tells the whole story. Two samples with equal mass can contain very different particle counts if their diameters differ. This calculator helps bridge that gap.
By combining diameter, density, purity, and suspension volume, the page estimates particle number concentration and molarity. Those outputs support dilution planning, dosing design, batch comparisons, and sampling workflows. The added surface-area estimate is useful when reactions depend on exposed area rather than only bulk mass.
The shape factor adds a practical correction when particles are not perfectly spherical. While any estimate still depends on representative size and density data, this workflow gives a quick starting point for lab planning and technical review.
It estimates particle count, concentration per milliliter, diluted concentration, molarity, and surface area from diameter, density, mass, suspension volume, purity, and dilution inputs.
Density converts particle volume into particle mass. Without density, the calculator cannot estimate how many particles are represented by the measured sample mass.
Shape factor adjusts the theoretical spherical volume. It is useful when particles are elongated, porous, or irregular, and the simple sphere model would understate or overstate mass per particle.
Yes. It uses one average diameter and one density value. Real samples usually have size distributions, so the result should be treated as an engineering estimate.
Purity reduces the usable nanoparticle mass before count estimation. This helps when the weighed sample includes ligands, solvent residue, binders, or other nonparticle material.
Molarity is calculated from particles per liter divided by Avogadro’s constant. It represents moles of particles, not moles of atoms inside each particle.
Use it when the original suspension was diluted before measurement or handling. The calculator reports both original and diluted concentration values for comparison.
Yes, but only if your density and purity reasonably represent the full particle system. For multilayer particles, use effective values based on your characterization method.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.